ceph/src/boost/libs/tti/doc/tti_enclosing_type.qbk

   1 [/
   2   (C) Copyright Edward Diener 2013
   3   Distributed under the Boost Software License, Version 1.0.
   4   (See accompanying file LICENSE_1_0.txt or copy at
   5   http://www.boost.org/LICENSE_1_0.txt).
   6 ]
   7
   8 [section:tti_enclosing_type Enclosing Type]
   9
  10 The enclosing type you introspect with TTI must be a valid type
  11 at the point in which you invoke the macro metafunction. If it is
  12 not a valid type at that point you will receive a compiler error.
  13
  14 If the enclosing type is a valid type but is not a class type you
  15 will not receive a compiler error, but the result of the introspection
  16 will always return 'false' or, in the case of the metafunction generated
  17 by BOOST_TTI_MEMBER_TYPE, will always return the marker type.
  18
  19 When using the macro metafunctions generated by BOOST_TTI_HAS_MEMBER_DATA
  20 and BOOST_TTI_HAS_MEMBER_FUNCTION the first template parameter may be an
  21 enclosing type or a pointer to member data or member function respectively.
  22 In each of these cases TTI can distinguish between the two possibilities and
  23 only if the first template parameter is an enclosing type, once again if it is
  24 a valid type but not a class type you will not receive a compiler error but
  25 the result of the introspection will return 'false'.
  26
  27 [endsect]